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Investments in fixed maturity securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of investments in securities with fixed maturities | Investments in fixed maturity securities are summarized as follows (in millions).
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
September 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, U.S. government corporations and agencies |  | $ | 4,613 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 4,626 |
Foreign governments |  |  | 11,822 |  |  |  | 39 |  |  |  | (19 | ) |  |  | 11,842 |
Corporate and other |  |  | 1,240 |  |  |  | 239 |  |  |  | (4 | ) |  |  | 1,475 |
|  | $ | 17,675 |  |  | $ | 291 |  |  | $ | (23 | ) |  | $ | 17,943 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, U.S. government corporations and agencies |  | $ | 4,447 |  |  | $ | 16 |  |  | $ | (4 | ) |  | $ | 4,459 |
Foreign governments |  |  | 9,443 |  |  |  | 16 |  |  |  | (97 | ) |  |  | 9,362 |
Corporate and other |  |  | 1,324 |  |  |  | 225 |  |  |  | (6 | ) |  |  | 1,543 |
|  | $ | 15,214 |  |  | $ | 257 |  |  | $ | (107 | ) |  | $ | 15,364 |
Schedule of amortized cost and estimated fair value of securities with fixed maturities | The amortized cost and estimated fair value of fixed maturity securities at September 30, 2025 are summarized below by contractual maturity dates (in millions). Actual maturities may differ from contractual maturities due to prepayment rights held by issuers.
|  | Due in one year or less |  |  | Due after one year through five years |  |  | Due after five years through ten years |  |  | Due after ten years |  |  | Mortgage- backed securities |  |  | Total |
Amortized cost |  | $ | 12,780 |  |  | $ | 4,179 |  |  | $ | 498 |  |  | $ | 109 |  |  | $ | 109 |  |  | $ | 17,675 |
Fair value |  |  | 12,829 |  |  |  | 4,179 |  |  |  | 693 |  |  |  | 120 |  |  |  | 122 |  |  |  | 17,943 |

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